A new method to detect infrared single photon using avalanche photodiodes is proposed, which combine the
requirements of a single photon detector control circuit and features of the electric pulses generator by transient process
of transmission lines. When the terminated boundary conditions of transmission lines are changed quickly, voltage across
the switch devices will drop suddenly in the electric pulses generator model and at the same time a signal that can reflect
the drive information of the switch device will export from load resistance. So we can replace the switch with avalanche
photodiodes who can act as an excellent optoelectronic switch. Then when faint laser pulses enter the avalanche
photodiode, resistance of the avalanche photodiode will decrease quickly and with that voltage across avalanche
photodiodes will drop simultaneously and a signal that can reflect the single-photon laser pulses will export from the
load resistance. The simulation results are given for the new quenching circuit model of avalanche photodiodes and the
analyses emphasis on the feasibility of the quenching model and the influence of each electrical component on the
performance of the quenching circuit. Finally optimal parameter of the electrical components in the model is
demonstrated.